# Lucky Four – CodeChef Solution

Hello coders, today we are going to solve Lucky Four CodeChef Solution whose Problem code is LUCKFOUR.

## Problem

Kostya likes the number 4 much. Of course! This number has such a lot of properties, like:

• Four is the smallest composite number;
• It is also the smallest Smith number;
• The smallest non-cyclic group has four elements;
• Four is the maximal degree of the equation that can be solved in radicals;
• There is four-color theorem that states that any map can be colored in no more than four colors in such a way that no two adjacent regions are colored in the same color;
• Lagrange’s four-square theorem states that every positive integer can be written as the sum of at most four square numbers;
• Four is the maximum number of dimensions of a real division algebra;
• In bases 6 and 12, 4 is a 1-automorphic number;

Impressed by the power of this number, Kostya has begun to look for occurrences of four anywhere. He has a list of T integers, for each of them he wants to calculate the number of occurrences of the digit 4 in the decimal representation. He is too busy now, so please help him.

## Input

The first line of input consists of a single integer T, denoting the number of integers in Kostya’s list.

Then, there are T lines, each of them contain a single integer from the list.

## Output

Output T lines. Each of these lines should contain the number of occurences of the digit 4 in the respective integer from Kostya’s list.

## Constraints

• 1 â‰¤ T â‰¤ 10^5
• (Subtask 1): 0 â‰¤ Numbers from the list â‰¤ 9 – 33 points.
• (Subtask 2): 0 â‰¤ Numbers from the list â‰¤ 109 – 67 points.

Input:

```5
447474
228
6664
40
81```

Output:

```4
0
1
1
0```

## Solution – Lucky Four codeChef Solution

### Python 3

```T = int(input())
for _ in range(T):
n = int(input())
count = 0
while n > 0:
if n % 10 == 4:
count += 1
n = n // 10
print(count)```

Disclaimer: The above Problem (Lucky Four) is generated by CodeChef but the Solution is provided by CodingBroz. This tutorial is only for Educational and Learning Purposes.